diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/entities/KeyTransparencySearchRequest.java b/service/src/main/java/org/whispersystems/textsecuregcm/entities/KeyTransparencySearchRequest.java
index 3142a7c3c..897988614 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/entities/KeyTransparencySearchRequest.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/entities/KeyTransparencySearchRequest.java
@@ -51,7 +51,6 @@ public record KeyTransparencySearchRequest(
     @Schema(description = "The non-distinguished tree head size to prove consistency against.")
     Optional<@Positive Long> lastTreeHeadSize,
 
-    @NotNull
     @Schema(description = "The distinguished tree head size to prove consistency against.")
     @Positive long distinguishedTreeHeadSize
 ) {